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CVE-2026-89608

7.1 · HIGH

In the Linux kernel, the following vulnerability has been resolved: ecryptfs: pass packet set buffer size to parser ecryptfs_parse_packet_set() receives a pointer into the file header, but it cal…

Published Sep 11, 2026EPSS 0.16%

Overview

CVE-2026-89608 is a high-severity vulnerability. It was published on September 11, 2026 and has a CVSS 3.1 base score of 7.1 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.1, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

ecryptfs: pass packet set buffer size to parser

ecryptfs_parse_packet_set() receives a pointer into the file header, but

it calculates the remaining packet buffer size from PAGE_SIZE - 8. For

version 1 headers the packet set starts later in the header, so this can

overstate the available buffer.

Pass the actual packet set buffer length from the caller and calculate

per-packet limits from the remaining bytes in that buffer. Recompute the

remaining length after consuming a tag 3 packet before parsing the

following tag 11 packet.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/2602b79c5b3e2f6fce12e38a670f8e3fda4e46a2Refgit.kernel.org/stable/c/329de8b9e988b152b938f09224670d97bada0b96Refgit.kernel.org/stable/c/3bd9bb3e167a7c14a50423f6ff03ee0fb007199dRefgit.kernel.org/stable/c/66a87559ecb26afe80ad512faf728a158e2b81daRefgit.kernel.org/stable/c/747fd45be396a6aea3420ab657a0ab4e60185b05Refgit.kernel.org/stable/c/749fa08d8f1b318bd8f4669a14a8a4a8c1bbdaacRefgit.kernel.org/stable/c/e5d254e654f2311a3c4b9c791d7f216554bcd17aRefgit.kernel.org/stable/c/e7573b0e3058c6bbdfe81673f22c09900fde9e65

How CyberStrike helps

Frequently asked questions

What is CVE-2026-89608?

CVE-2026-89608 is a high-severity vulnerability. It was published on September 11, 2026 and has a CVSS 3.1 base score of 7.1 (HIGH).

How severe is CVE-2026-89608?

This vulnerability has a CVSS 3.1 base score of 7.1, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-89608?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-89608?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-89608 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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